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-rw-r--r--test/goto.go538
1 files changed, 538 insertions, 0 deletions
diff --git a/test/goto.go b/test/goto.go
new file mode 100644
index 0000000..d660c9c
--- /dev/null
+++ b/test/goto.go
@@ -0,0 +1,538 @@
+// errorcheck
+
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Verify goto semantics.
+// Does not compile.
+//
+// Each test is in a separate function just so that if the
+// compiler stops processing after one error, we don't
+// lose other ones.
+
+package main
+
+var (
+ i, n int
+ x []int
+ c chan int
+ m map[int]int
+ s string
+)
+
+// goto after declaration okay
+func _() {
+ x := 1
+ goto L
+L:
+ _ = x
+}
+
+// goto before declaration okay
+func _() {
+ goto L
+L:
+ x := 1
+ _ = x
+}
+
+// goto across declaration not okay
+func _() {
+ goto L // ERROR "goto L jumps over declaration of x at LINE+1|goto jumps over declaration"
+ x := 1 // GCCGO_ERROR "defined here"
+ _ = x
+L:
+}
+
+// goto across declaration in inner scope okay
+func _() {
+ goto L
+ {
+ x := 1
+ _ = x
+ }
+L:
+}
+
+// goto across declaration after inner scope not okay
+func _() {
+ goto L // ERROR "goto L jumps over declaration of x at LINE+5|goto jumps over declaration"
+ {
+ x := 1
+ _ = x
+ }
+ x := 1 // GCCGO_ERROR "defined here"
+ _ = x
+L:
+}
+
+// goto across declaration in reverse okay
+func _() {
+L:
+ x := 1
+ _ = x
+ goto L
+}
+
+// error shows first offending variable
+func _() {
+ goto L // ERROR "goto L jumps over declaration of y at LINE+3|goto jumps over declaration"
+ x := 1 // GCCGO_ERROR "defined here"
+ _ = x
+ y := 1
+ _ = y
+L:
+}
+
+// goto not okay even if code path is dead
+func _() {
+ goto L // ERROR "goto L jumps over declaration of y at LINE+3|goto jumps over declaration"
+ x := 1 // GCCGO_ERROR "defined here"
+ _ = x
+ y := 1
+ _ = y
+ return
+L:
+}
+
+// goto into outer block okay
+func _() {
+ {
+ goto L
+ }
+L:
+}
+
+// goto backward into outer block okay
+func _() {
+L:
+ {
+ goto L
+ }
+}
+
+// goto into inner block not okay
+func _() {
+ goto L // ERROR "goto L jumps into block starting at LINE+1|goto jumps into block"
+ { // GCCGO_ERROR "block starts here"
+ L:
+ }
+}
+
+// goto backward into inner block still not okay
+func _() {
+ { // GCCGO_ERROR "block starts here"
+ L:
+ }
+ goto L // ERROR "goto L jumps into block starting at LINE-3|goto jumps into block"
+}
+
+// error shows first (outermost) offending block
+func _() {
+ goto L // ERROR "goto L jumps into block starting at LINE+3|goto jumps into block"
+ {
+ {
+ { // GCCGO_ERROR "block starts here"
+ L:
+ }
+ }
+ }
+}
+
+// error prefers block diagnostic over declaration diagnostic
+func _() {
+ goto L // ERROR "goto L jumps into block starting at LINE+3|goto jumps into block"
+ x := 1
+ _ = x
+ { // GCCGO_ERROR "block starts here"
+ L:
+ }
+}
+
+// many kinds of blocks, all invalid to jump into or among,
+// but valid to jump out of
+
+// if
+
+func _() {
+L:
+ if true {
+ goto L
+ }
+}
+
+func _() {
+L:
+ if true {
+ goto L
+ } else {
+ }
+}
+
+func _() {
+L:
+ if false {
+ } else {
+ goto L
+ }
+}
+
+func _() {
+ goto L // ERROR "goto L jumps into block starting at LINE+1|goto jumps into block"
+ if true { // GCCGO_ERROR "block starts here"
+ L:
+ }
+}
+
+func _() {
+ goto L // ERROR "goto L jumps into block starting at LINE+1|goto jumps into block"
+ if true { // GCCGO_ERROR "block starts here"
+ L:
+ } else {
+ }
+}
+
+func _() {
+ goto L // ERROR "goto L jumps into block starting at LINE+2|goto jumps into block"
+ if true {
+ } else { // GCCGO_ERROR "block starts here"
+ L:
+ }
+}
+
+func _() {
+ if false { // GCCGO_ERROR "block starts here"
+ L:
+ } else {
+ goto L // ERROR "goto L jumps into block starting at LINE-3|goto jumps into block"
+ }
+}
+
+func _() {
+ if true {
+ goto L // ERROR "goto L jumps into block starting at LINE+1|goto jumps into block"
+ } else { // GCCGO_ERROR "block starts here"
+ L:
+ }
+}
+
+func _() {
+ if true {
+ goto L // ERROR "goto L jumps into block starting at LINE+1|goto jumps into block"
+ } else if false { // GCCGO_ERROR "block starts here"
+ L:
+ }
+}
+
+func _() {
+ if true {
+ goto L // ERROR "goto L jumps into block starting at LINE+1|goto jumps into block"
+ } else if false { // GCCGO_ERROR "block starts here"
+ L:
+ } else {
+ }
+}
+
+func _() {
+ // This one is tricky. There is an implicit scope
+ // starting at the second if statement, and it contains
+ // the final else, so the outermost offending scope
+ // really is LINE+1 (like in the previous test),
+ // even though it looks like it might be LINE+3 instead.
+ if true {
+ goto L // ERROR "goto L jumps into block starting at LINE+2|goto jumps into block"
+ } else if false {
+ } else { // GCCGO_ERROR "block starts here"
+ L:
+ }
+}
+
+/* Want to enable these tests but gofmt mangles them. Issue 1972.
+
+func _() {
+ // This one is okay, because the else is in the
+ // implicit whole-if block and has no inner block
+ // (no { }) around it.
+ if true {
+ goto L
+ } else
+ L:
+}
+
+func _() {
+ // Still not okay.
+ if true { //// GCCGO_ERROR "block starts here"
+ L:
+ } else
+ goto L //// ERROR "goto L jumps into block starting at LINE-3|goto jumps into block"
+}
+
+*/
+
+// for
+
+func _() {
+ for {
+ goto L
+ }
+L:
+}
+
+func _() {
+ for {
+ goto L
+ L:
+ }
+}
+
+func _() {
+ for { // GCCGO_ERROR "block starts here"
+ L:
+ }
+ goto L // ERROR "goto L jumps into block starting at LINE-3|goto jumps into block"
+}
+
+func _() {
+ for { // GCCGO_ERROR "block starts here"
+ goto L
+ L1:
+ }
+L:
+ goto L1 // ERROR "goto L1 jumps into block starting at LINE-5|goto jumps into block"
+}
+
+func _() {
+ for i < n { // GCCGO_ERROR "block starts here"
+ L:
+ }
+ goto L // ERROR "goto L jumps into block starting at LINE-3|goto jumps into block"
+}
+
+func _() {
+ for i = 0; i < n; i++ { // GCCGO_ERROR "block starts here"
+ L:
+ }
+ goto L // ERROR "goto L jumps into block starting at LINE-3|goto jumps into block"
+}
+
+func _() {
+ for i = range x { // GCCGO_ERROR "block starts here"
+ L:
+ }
+ goto L // ERROR "goto L jumps into block starting at LINE-3|goto jumps into block"
+}
+
+func _() {
+ for i = range c { // GCCGO_ERROR "block starts here"
+ L:
+ }
+ goto L // ERROR "goto L jumps into block starting at LINE-3|goto jumps into block"
+}
+
+func _() {
+ for i = range m { // GCCGO_ERROR "block starts here"
+ L:
+ }
+ goto L // ERROR "goto L jumps into block starting at LINE-3|goto jumps into block"
+}
+
+func _() {
+ for i = range s { // GCCGO_ERROR "block starts here"
+ L:
+ }
+ goto L // ERROR "goto L jumps into block starting at LINE-3|goto jumps into block"
+}
+
+// switch
+
+func _() {
+L:
+ switch i {
+ case 0:
+ goto L
+ }
+}
+
+func _() {
+L:
+ switch i {
+ case 0:
+
+ default:
+ goto L
+ }
+}
+
+func _() {
+ switch i {
+ case 0:
+
+ default:
+ L:
+ goto L
+ }
+}
+
+func _() {
+ switch i {
+ case 0:
+
+ default:
+ goto L
+ L:
+ }
+}
+
+func _() {
+ switch i {
+ case 0:
+ goto L
+ L:
+ ;
+ default:
+ }
+}
+
+func _() {
+ goto L // ERROR "goto L jumps into block starting at LINE+2|goto jumps into block"
+ switch i {
+ case 0:
+ L: // GCCGO_ERROR "block starts here"
+ }
+}
+
+func _() {
+ goto L // ERROR "goto L jumps into block starting at LINE+2|goto jumps into block"
+ switch i {
+ case 0:
+ L: // GCCGO_ERROR "block starts here"
+ ;
+ default:
+ }
+}
+
+func _() {
+ goto L // ERROR "goto L jumps into block starting at LINE+3|goto jumps into block"
+ switch i {
+ case 0:
+ default:
+ L: // GCCGO_ERROR "block starts here"
+ }
+}
+
+func _() {
+ switch i {
+ default:
+ goto L // ERROR "goto L jumps into block starting at LINE+1|goto jumps into block"
+ case 0:
+ L: // GCCGO_ERROR "block starts here"
+ }
+}
+
+func _() {
+ switch i {
+ case 0:
+ L: // GCCGO_ERROR "block starts here"
+ ;
+ default:
+ goto L // ERROR "goto L jumps into block starting at LINE-4|goto jumps into block"
+ }
+}
+
+// select
+// different from switch. the statement has no implicit block around it.
+
+func _() {
+L:
+ select {
+ case <-c:
+ goto L
+ }
+}
+
+func _() {
+L:
+ select {
+ case c <- 1:
+
+ default:
+ goto L
+ }
+}
+
+func _() {
+ select {
+ case <-c:
+
+ default:
+ L:
+ goto L
+ }
+}
+
+func _() {
+ select {
+ case c <- 1:
+
+ default:
+ goto L
+ L:
+ }
+}
+
+func _() {
+ select {
+ case <-c:
+ goto L
+ L:
+ ;
+ default:
+ }
+}
+
+func _() {
+ goto L // ERROR "goto L jumps into block starting at LINE+2|goto jumps into block"
+ select {
+ case c <- 1:
+ L: // GCCGO_ERROR "block starts here"
+ }
+}
+
+func _() {
+ goto L // ERROR "goto L jumps into block starting at LINE+2|goto jumps into block"
+ select {
+ case c <- 1:
+ L: // GCCGO_ERROR "block starts here"
+ ;
+ default:
+ }
+}
+
+func _() {
+ goto L // ERROR "goto L jumps into block starting at LINE+3|goto jumps into block"
+ select {
+ case <-c:
+ default:
+ L: // GCCGO_ERROR "block starts here"
+ }
+}
+
+func _() {
+ select {
+ default:
+ goto L // ERROR "goto L jumps into block starting at LINE+1|goto jumps into block"
+ case <-c:
+ L: // GCCGO_ERROR "block starts here"
+ }
+}
+
+func _() {
+ select {
+ case <-c:
+ L: // GCCGO_ERROR "block starts here"
+ ;
+ default:
+ goto L // ERROR "goto L jumps into block starting at LINE-4|goto jumps into block"
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 11:13:02 +0000